Low 2.3Published Jul 14, 2026

CVE-2026-45066Symfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification

Updated under an hour ago (Oct 27, 2026, 7:00 PM ET)

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It affects symfony and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for symfony

Exploited in the last 30 days

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because <area href> is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.

CVSS: 2.3 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness (CWE): CWE-184, CWE-436
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

symfony symfony symfony:symfony (from the name)	from 6.1.0-BETA1, < 6.4.40; from 7.0.0-BETA1, < 7.4.12; from 8.0.0-BETA1, < 8.0.12	CNA record
symfony html-sanitizer symfony:html_sanitizer (from the name)	from 6.1.0-BETA1, < 6.4.40; from 7.0.0-BETA1, < 7.4.12; from 8.0.0-BETA1, < 8.0.12	CNA record
sensiolabs symfony sensiolabs:symfony	from 6.1.0 before 6.4.40; from 7.0.0 before 7.4.12; from 8.0.0 before 8.0.12	NVD

References

References

https://github.com/symfony/symfony/security/advisories/GHSA-qc95-4862-92fh	x-refsource-confirm, patch, vendor-advisory
https://github.com/symfony/symfony/commit/d506b556d3d3906f3e8660ad82257ce87edbaac4	x-refsource-misc, patch
https://github.com/symfony/symfony/releases/tag/v6.4.40	x-refsource-misc, product, release-notes
https://github.com/symfony/symfony/releases/tag/v7.4.12	x-refsource-misc, product, release-notes
https://github.com/symfony/symfony/releases/tag/v8.0.12	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.